Gas engine



Nov. 27, 1934. H. D. MURRAY GAS ENGINE original Filed Deo. :5, 1927 l 2 Sheets-Sheet 1 Ivy? A TTORNEYS.

N0V-f 27,- 1934 H, D. MURRAY 1,982,229

GAS ENGINE I Original Filed Dec. 3, 1927 2 Sheets-Sheet 2 5 Y 3 29 30 A f 3/ L Le v ,fw 49 y fm H ,a

@Wl/M I l BY: 7/2 M ATTORNEYS.

Patented Nov. 27, 1934 GAS ENGINEv y Harry D. `Murray, Grove City, a., assignor toThe Cooper-Bessemer Corporation, Mount' Vernon, Ohio, a corporation of Ohio Continuation of applicationserial No.`23'1,421,

December 3, 1927, now Patent No.1,791,9 69,` dated February 10, 1931. ThisV application February 9, 1931, Serial No. 514,462. "Renewed October 8, 1934 aolaims. (01.12345) The present invention is a continuation of my application on `which Patent #1,791,969 was ,issued Feb. 10, 1931. This 'application is particularly directed to the manner of mounting and Y operatingthe inlet valve tothe combustionchamber of a two-cycle engine. With such valves, particularly of some types, a nice degree of timing is'essential and I have devised a mechanism in which the timing can be very definitely accomplished.` Features and details of` the invention will appear from thespecificati'on'and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as followsz- Y Fig. 1 shows a side elevation of the engine.

` Fig. 2 a. central section through a part of the cylinder. Y V

Fig. 3 a sectional view of the cylinder showing the inlet valve. Fig. fla-side elevation of the inlet valve actuat-V ing mechanism.

Fig. 5 a sectional view of the control valve. Fig. 6 a sectional view extending longitudinally along the valve actuating mechanism, the view V being toward the right as viewed in Fig. 4.

1 marks the engine bed, 2 the engine cylinder, 3 the crank shaft, 4 the piston, 4a the piston rod which operates on the crank (not shown) in the.

usual manner. Gas is supplied through a pipe 5. It delivers through a branch 5a. to a compressor 6, the compressor being driven from a crank 7 on the crank shaft. A pipe 8 leads from the compressor to a receiver 9. A pipe 10 leads from the receiver. A bypass 11 extends from the pipe 10 to a pipe 13. A regulating valve 12 is arranged in the pipe 11 and Weighted to close on a predetermined pressure. It will be noted that any excess of pressure in the receiver 9 incident to the action of the compressor 6 is immediately bypassed by -`IWay of the pipe 11 and regulating valve 12 back to the supply pipe 5 so that it is again run through the compressor. In this Way a definite pressure may be maintained in the receiver 9.

A governor valve 15 is arranged in the pipe 10.

".JAny ordinary governor may be used. As shown it is an ordinary throttle governor driven from a belt 16 extending to the crankshaft, or other driven part of the engine. A pipe 17 leads from y the governor valve kto an inlet valve chamber 18. An inlet port 19 leads from the chamber 18 and is controlled by an inlet valve 20. The valve chamber is preferably formed in a separate unit forming a valve fitting, this unit being secured on the cylinder` head and having a projection .extending into an opening in the cylinder head sothat the inlet valve is well Vadvanced toward the combustion chamber. The inlet valve 20 has a'stem 21. Ay spring n22 yieldinglyholds thel inlet valve in closed position.- A shoulder 23 is arranged on the stern ofthe inlet valve and is engaged by an arm24. "The forked arm 24 is fixed on'a rock shaft 24a journaledin a` bracket 25 extending from the fitting lon thecylinder head.

Arock arm 26 is actuated bya rod 27, this rod being actuated by a cam, or'eccentric (not shown) on the engine shaft. The rock arm is journaled loosely o n the rock shaft 24a. y It has extending from' it and rocked with itan arm 28. A latch 29 ispivotallymounted by means of a pin 30 on the arm 28. 'I'he latch 29 is thereby fastened to the arm 28 and oscillates with the arm v28 and rock arm'26. VTheA latch hasa locking-`shoulder 31 which with each oscillation drops over and engages a finger 32. The finger 32 is fixed on the shaft 24a and consequently actuates as itrocks the arm 24 which is also xed on the rock shaft. The latch 29 has an arm' 33 which rides a cam 34. This cam is mounted on the bracket 25 and is stationary, but may be made adjustable on the bracket to trip the latch at any desired point. A spring exerts pressure on the latch and yieldingly urges the latch into engagement with the nger 32. In the operation of the latch mechanism the oscillation of the arm 26 rocks with lt the arm 28 which extends rigidly from the arm 26, but does not rock the shaft 24a on which the arm 26 is journaled. The arm 28 reciprocates the latch 29 being fastened to the latch at the pivot 30. The latch rides the stationary cam 34 carried by the bracket 24 and lifts the latch off the finger 32 at the proper timing moment. The cam also locates the end of the latch so that on the return movement it will ride over the end of the latch in order to drop into engaging position.

Air is delivered to the engine through an air inlet valve 36 which delivers air to a chamber 37. This chamber is connected by a port 38 with the front end of the cylinder, the piston operating in connection with the front end of the cylinder forming an air pump. The piston rod 4a extends through a gland `40 and thus forms a pump shoulder. The chamber 3'7 is connected by a port 41 with an air inlet port 42 which is controlled by the piston in the ordinary manner of a two-cycle engine. An exhaust port 43 is also provided in the manner of the ordinary two cycle engine and controlled by the piston.

A gas pipe 39 leads to a gas port 39a, which port is closed and opened by the elements of the air valve, the air valve as shown being of the ordinary plate variety. Thus the air valve when gas is delivered through the pipe 39 operates as a mixing valve and the chamber 37 as a mixing chamber. i

A three-way valve 44 is arranged at the junction of the pipes 10 and 13. The plug of this valve is provided with ways 45, 46 and 47. A threeway valve 48 is arranged at the junction of the pipe 17 and 39. The plug of this valve is provided with the ways 49, and 51. With the parts as shown in the drawings, gas lsj'beirigrdelivered by way of the ports 45, 47 directly through the pipe 10 and through the ports 49-51 directly through the pipe 17 sogthat gas isy delivered through the inlet valve 20, andv cut oi from. the

mixing valve. 'I'he valves 44e arid are provided;

with operating handles 44a. ar1d48ai respectively. When it is desired to operate the engine with the gas delivered through the mixing valve and consequently with a suction effort on the 'gas line the valve 44v isthrown so that the port 47 leads from thepipe 13 and the port 46 isinregister with the -upper endofl the pipe l0 and thelower part of the pipe l0 is`cutof f.v Thus gas is re- L ceived directfrom the supply pipe 5- by way ofthe pipe 13. At the same time, the valve 48 is thrown, bringingthe port 49 .into register with-the pipe 39 and the port 50 intdregister with the incoming side of the pipe 17, Thus` gas is permitted to flow from the initial end of the pipe 17 to the pipe 39, but isl cut off from the inlet valve 20. It will be seen, thereforeVthat they engine may be operated. either forthe direct injection of the gas, -or the gas may be drawn in with the air and delivered as a mixture at theA williof the operator. This selective manner of operating the engine forms the subject matter of my former application. Y

What I claim as new isa-,-

1. In an internal combustionengine, the combination of a cylinder-head adapted to close a said seat; a stem extending through the fuel valve chamber; a rock arm actuating the stem; a latch operating the rock arm; means operating the latch; and meansreleasing the latch to control the timing of the valve.

2. Inv aninternal combustion engine, the combination of'an inletfuel valve; a fitting having a valve seat onwhich the valve operates, a stern extendingfrom the' valve; a rock arm actuating 'the'. stem; va shaftl on which the rock arm is mounted, said shaft being journaled in the fitrting; a latch arm on the shaft; a latch operating yon the latch arm; an actuating arm journaled on the shaft, theflatch-.being ypi-votallysecured to and actuated bythe actuating arm; and a cam finger on thelatch; anda cam mounted on the fittingonwhich -the finger rides.

3. lnanj internal combustionengine, they combination vof a cylinderr head adapted to close a combustion chamber, saidhead having a fuel valve opening; a fuel valve fitting having a fuel valve chamber; said fitting being secured onthe head and having a valve seat on its inner end; a valve `mechanism mounted on the fitting and comprising a fuel valve operating on said seat;

a stem extending throughthe fuel valve chamber;

a rock arm actuating the stem; a shaft onwhich the rock arm is secured; aV latch arm secured on the shafta latch operating on the latch arm; an actuating arm journaled on the shaft, the latch being pivotally secured.. to` andv actuated by the actuating arm; a cam finger on the latch; and a cam on the fitting on lwhich the finger rides.

. HARRY D. MURRAY. n 

